A kind of superhydrophobic geopolymer prepared by microcellular foaming and preparation method thereof

A technology of microporous foaming and geopolymers, applied in applications, ceramic products, cement production, etc., can solve problems such as difficulty in resisting mechanical damage, general hydrophobic effect, weak resistance to mechanical damage, etc., and achieve improvement of micron-level roughness Degree, avoid mechanical damage, improve the effect of mechanical strength

Active Publication Date: 2021-06-01
ZHEJIANG UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the existing research, the Chinese patent with the application number CN 201710641887.6 is "Preparation Method of High-Strength Porous Water-absorbing Geopolymer". This method is complicated to prepare foaming agent and requires high-temperature sintering. And did not realize the hydrophobic modification of the material
[0005] The Chinese patent with the application number CN 201510638847.7 is "A metakaolin-based geopolymer with a superhydrophobic surface and its preparation method". Hydrophobic modification of geopolymers only from the surface, which is difficult to resist mechanical damage
[0006] The Chinese patent with the application number CN 201911293381.6 is "An Inorganic Thermal Insulation and Fireproof Hydrophobic Coating and Its Preparation Method". Coating, weak ability to resist mechanical damage
[0007] The Chinese patent with the application number CN 201911189687.7 is "A Hydrophobic Antibacterial Geopolymer Material for Marine Concrete Structures and Its Preparation Method". General effect

Method used

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  • A kind of superhydrophobic geopolymer prepared by microcellular foaming and preparation method thereof
  • A kind of superhydrophobic geopolymer prepared by microcellular foaming and preparation method thereof
  • A kind of superhydrophobic geopolymer prepared by microcellular foaming and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A superhydrophobic geopolymer prepared by microporous foaming, comprising 20 parts of metakaolin, 10 parts of fly ash, 10 parts of silica fume, 40 parts of alkali activator, 1.5 parts of polydimethylsiloxane, silane coupling 0.15 parts of joint agent, 3 parts of silicon carbide powder, 2 parts of basalt fiber, 1 part of alkyl glycoside, 2 parts of hydrogen peroxide.

[0031] The alkali activator is a composite material, which includes 10 parts of fixed sodium hydroxide, 20 parts of sodium silicate solution, and 10 parts of deionized water. When preparing the alkali activator, use a stirring rod to stir until it is uniform and clear, and then pour it into a plastic container and keep it sealed for 12 hours.

[0032] The viscosity of polydimethylsiloxane is 100 Stokes; the particle size of silicon carbide powder is 50-100 nanometers; the diameter of basalt fiber is 20-25 microns, and the average length is 5 mm; the concentration of hydrogen peroxide is 35% .

[0033] A ...

Embodiment 2

[0040] A superhydrophobic geopolymer prepared by microcellular foaming, comprising 15 parts of metakaolin, 5 parts of fly ash, 15 parts of silica fume, 45 parts of alkali activator, 1.5 parts of polydimethylsiloxane, silane 0.15 parts of joint agent, 2 parts of silicon carbide powder, 2 parts of silicon nitride fiber, 2 parts of alkyl glycoside, 2 parts of hydrogen peroxide.

[0041] The alkali activator is a compound material, which includes 10 parts of fixed sodium hydroxide, 25 parts of sodium silicate solution, and 10 parts of deionized water. When preparing the alkali activator, use a stirring rod to stir until it is uniform and clear, and then pour it into a plastic container and keep it sealed for 12 hours.

[0042] The viscosity of polydimethylsiloxane is 100 Stokes; the particle size of silicon carbide powder is 100-200 nanometers; the diameter of silicon nitride fiber is 10-15 microns, and the average length is 2 mm; the concentration of hydrogen peroxide is 30%.

[...

Embodiment 3

[0050] A superhydrophobic geopolymer prepared by microcellular foaming, comprising 20 parts of metakaolin, 10 parts of fly ash, 10 parts of silica fume, 45 parts of alkali activator, 1 part of polydimethylsiloxane, silane 0.1 part of joint agent, 3 parts of silicon carbide powder, 2 parts of basalt fiber, 1 part of alkyl glycoside, 3 parts of hydrogen peroxide.

[0051] The alkali activator is a compound material, which includes 8 parts of fixed sodium hydroxide, 25 parts of sodium silicate solution, and 12 parts of deionized water. When preparing the alkali activator, use a stirring rod to stir until it is uniform and clear, and then pour it into a plastic container and keep it sealed for 12 hours.

[0052] The viscosity of polydimethylsiloxane is 50 Stokes; the particle size of silicon carbide powder is 100-200 nanometers; the diameter of basalt fiber is 20-25 microns, and the average length is 5 mm; the concentration of hydrogen peroxide is 30% .

[0053] A method for pre...

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Abstract

The invention discloses a superhydrophobic geopolymer prepared by microporous foaming, which comprises the following raw materials in parts by weight: 30-45 parts of silicon-aluminum mineral raw materials, 35-50 parts of alkali activator, polydimethylsilane 0.5-1.5 parts of oxane, 0.05-0.15 parts of silane coupling agent, 2-5 parts of silicon carbide powder, 2-4 parts of short fiber, 1-3 parts of alkyl glycoside, and 1-3 parts of hydrogen peroxide. The invention also discloses a preparation method of the superhydrophobic geopolymer prepared by microcellular foaming. The present invention utilizes the blocking effect of short fibers on air bubbles, and the properties of silicon carbide powder and its inherent impurities silicon element and carbon element reacting in a strong alkali environment to generate gas to realize a large number of uniform microbubble pore structures with adjustable pore diameters; Superhydrophobic modification is carried out from the internal structure of the material to avoid the performance being affected by mechanical damage, so that the material has a durable hydrophobic ability; to prepare low-density, high-strength, corrosion-resistant and high-temperature foamed materials, while hydrophobic and impermeable, can be used To filter adsorption, thermal insulation, foundation treatment, structure filling.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a superhydrophobic geopolymer prepared by microcellular foaming and a preparation method thereof. Background technique [0002] Geopolymer is a new type of gelling material formed by activating silica-alumina mineral raw materials with alkali activators. Geopolymer materials have a dense microstructure and a considerable number of micron-scale pore structures. They have high mechanical strength, fire and heat resistance, good corrosion resistance, green and low carbon, and can be used for protection and steel structures and concrete structures. [0003] However, the hydrophilic nature of inorganic materials enhances the water absorption and permeability of geopolymers, resulting in structural damage to materials such as material dissolution, freeze-thaw damage, and ion erosion. Most of the existing research on hydrophobic modification focuses on the produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/00C04B28/00C04B38/02C04B24/42C04B14/46C04B14/38C04B18/08C04B18/14C04B111/27C04B111/40
CPCC04B12/005C04B28/006C04B24/42C04B14/46C04B14/386C04B14/4687C04B14/4625C04B18/08C04B18/146C04B2111/27C04B2111/40C04B2201/20C04B2201/50C04B14/106C04B22/062C04B12/04C04B22/002C04B14/324C04B24/10C04B22/068C04B38/02C04B38/0067C04B38/0074Y02W30/91Y02P40/10C04B14/4668
Inventor 闫东明阮圣倩陈士堃李杉方宏远刘毅
Owner ZHEJIANG UNIV
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